Answer: The right answer is indeed "compeling," which should be spelled "compelling."
Explanation: Just to elaborate a little on the answer, it can be added that one of the rules of the English language states that the words that end with a <u>c</u>onsonant-<u>v</u>owel-<u>c</u>onsonant pattern, like com<u>pel</u>, get a double consonant when they are followed by ED or ING, as in com<u>pelling</u>. In addition, in two-syllable words, like compel, if the stress is on the second syllable, as in com<u>pel</u>, the word gets a double consonant when it is followed by ED or ING, hence the reason to write com<u>pelling</u> with a double l.
I am pretty sure it would be massive because it is an English question. If you are doing a multiple choice question you should see which one fits the best. If could also be positive impact.
